Capture of particles undergoing discrete random walks

Abstract

It is shown that particles undergoing discrete-time jumps in 3D, starting at a distance r0 from the center of an adsorbing sphere of radius R, are captured with probability (R - c sigma)/r0 for r0 much greater than R, where c is related to the Fourier transform of the scaled jump distribution and sigma is the distribution's root-mean square jump length. For particles starting on the surface of the sphere, the asymptotic survival probability is non-zero (in contrast to the case of Brownian diffusion) and has a universal behavior sigma/(R sqrt(6)) depending only upon sigma/R. These results have applications to computer simulations of reaction and aggregation.

minor corrections and some elaboration. In press, Journal of Chemical Physics

References in corpus (4)

• Precise Asymptotics for a Random Walker's Maximum
• Unified Solution of the Expected Maximum of a Random Walk and the Discrete Flux to a Spherical Trap
• On Lerch's transcendent and the Gaussian random walk
• General flux to a trap in one and three dimensions

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